I paired my iphone5 with my 2009 Honda Accord and after 3 weeks it became un-paired. I have tried several times and it will not pair while in the discover mode. Any suggestions?

When you go to bluetooth on the phone does it still list the vehicle? If so, tap on that listing. Does it connect then? If it does not include that listing any more, does the vehicle include a listing for the iPhone? If so, remove the listing for the iPhone. Turn bluetooth on for the phone, then put the vehicle into discovery mode. Check the vehicle user guide for how to put the vehicle into discovery mode. Once they both are in discovery mode, the phone should find the vehicle. If necessary enter the passcode for the vehicle in the phone. The pairing should complete.